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CA-93:18  

Last Revised:  September 19,1997

                Attached copyright statement





                               CERT Advisory

                               December 15, 1993

                SunOS/Solbourne loadmodule and modload Vulnerability

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            *** This advisory supersedes CA-91.22. ***



The CERT Coordination Center has received information concerning a

vulnerability in /usr/etc/modload and $OPENWINHOME/bin/loadmodule in Sun

Microsystems, Inc. SunOS 4.1.1, 4.1.2, 4.1.3, and 4.1.3c and OpenWindows 3.0

on all sun4 and Solbourne Computer, Inc. architectures.  The problem does not

exist in Solaris 2.x, Solaris x86, and sun3 architectures (OpenWindows 3.0

was not released for the sun3 architecture).



Sun has produced a patch for these vulnerabilities for sun4 architectures.

It is available through your local Sun Answer Center as well as through

anonymous FTP from the ftp.uu.net system in the /systems/sun/sun-dist

directory or from the ftp.eu.net system in the /sun/fixes directory.



Solbourne has announced a workaround that is included below.



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I.   Description



     loadmodule(8) and modload(8) can be exploited to execute a user's

     program using the effective UID of root.



II.  Impact



     This vulnerability allows a local user to gain root access.



III. Solution



     A. SunOS Solution



     Obtain and install the appropriate patches according to the

     instructions included with the patches.



     Module           Patch ID        Filename

     ----------       ---------       ---------------

     loadmodule       100448-02       100448-02.tar.Z



                  BSD Checksum = 19410 5

                  MD5 Checksum = 0215910cf65e055ed3042070bd961a22



     modload          101200-02       101200-02.tar.Z



                  BSD Checksum = 41677 28

                  MD5 Checksum = 626ab2917204eb6e6eb5f165cca3e908





     B. Solbourne Solution



     Solbourne systems do not support the "loadmodule" functionality.

     This vulnerability can be fixed on Solbourne systems by removing

     the setuid bit:



        chmod 0755 /usr/openwin/bin/loadmodule



     The modload program does not need to replaced or changed.



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The CERT Coordination Center wishes to thank Sun Microsystems, Inc.

and Solbourne Computers, Inc. for their support in responding to this

problem.

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If you believe that your system has been compromised, contact the CERT

Coordination Center or your representative in Forum of Incident

Response and Security Teams (FIRST).



Internet E-mail: cert@cert.org

Telephone: 412-268-7090 (24-hour hotline)

           CERT personnel answer 8:30 a.m.-5:00 p.m. EST(GMT-5)/EDT(GMT-4),

           and are on call for emergencies during other hours.



CERT Coordination Center

Software Engineering Institute

Carnegie Mellon University

Pittsburgh, PA 15213-3890



Past advisories, information about FIRST representatives, and other

information related to computer security are available for anonymous

FTP from info.cert.org.





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Copyright 1993 Carnegie Mellon University. Conditions for use, disclaimers,

and sponsorship information can be found in

http://www.cert.org/legal_stuff.html and http://ftp.cert.org/pub/legal_stuff .

If you do not have FTP or web access, send mail to cert@cert.org with

"copyright" in the subject line.



CERT is registered in the U.S. Patent and Trademark Office.



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Revision History:



September 19,1997  Attached Copyright Statement



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